| 摘要 |
For acquiring an image of a moving region of interest of an object, a corresponding X-ray image acquisition apparatus may include a semitransparent X-ray transmitting device comprised in a collimator which is positioned within a beam of irradiating X-rays thereby at least partly shielding regions on a surface of a detector. After acquiring an X-ray image by detecting X-rays transmitted through the object, the position of the device is automatically adjusted based on image information included in the at least partly shielded region on the detector surface. Taking into account X-ray absorption properties of the device, a virtual image may be calculated, the virtual image corresponding to an X-ray image as if there was no X-ray absorption within the collimator. From this virtual image, the region of interest may be derived, and wedges of said device may be positioned to continuously follow the region of interest. |
| 主权项 |
1. An adaptable X-ray imaging apparatus comprising an X-ray source, an X-ray detector having a surface as an X-ray-receiving surface, and a semitransparent X-ray transmitting device, said apparatus configured for acquiring an image of a region of interest of an object by irradiating, via said source, X-rays to said object and detecting, on the detector surface, X-rays transmitted through said object, said apparatus further comprising an X-ray shielding processor configured for:
positioning said X-ray transmitting device into a beam of the irradiating X-rays so as to thereby at least partly shield regions on said detector surface from X-rays of said beam, and so as to provide on said surface, spatially separating ones of said regions, at another region, said another region being unshielded from X-rays of said beam; acquiring, via said beam into which said X-ray transmitting device is positioned, an X-ray image by detecting X-rays transmitted through said object on said detector surface; deriving, from the irradiated X-rays, image information included in the at least partly shielded regions on said detector surface; and using the derived image information to automatically adjust the position of said X-ray transmitting device . |
